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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab7e2d6a5ac304f3fc1f6d71ac8e86571ba8f9a698695f1ab3d018685d802b9' 
  AND token = 'W7qYlIU7lXvluD5KcsnXyhkZ0EOX5CY1Eu/2ogfzP4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}