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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86ab4e34c75013009044199cce7db7f81c824ab8f8387c6337efa52e1cd6d86' 
  AND token = 'k/iW4YvpZ7jpVpzDa8WuMCwJ67cMEY/Dl12B80fW6CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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