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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdabe5def1b5bba0a9aa4431f142df5b2e6ddf3b45195b4185c440038dad76b1' 
  AND token = 'T6DEiDmQvyrufFRrCLFzKDzMJSn+4C+owDEWl1ld5HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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