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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e0a01cfde8de9f7b112ce979d1dfd4d29cc9b0044b0246d68125332bd9c91f' 
  AND token = 'wnugOy9HMOkpKRmb3mP/VqF24x8im3JKy+EZkgUiL+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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