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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6b42dd602e29fa7cb22074650d656d1d05a395e122ddb489bc227ce634d603f' 
  AND token = 'rdF2k5u3PDZ8M40A3tWcIPVi/qm38bctwAP1TI8yWJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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