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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0825a35bedbc4007b94b70c4f1c0effcd93ffe942f997a51b9395270c60dc57' 
  AND token = 'X6V2bTx4BpZ4tea5UCwtILSO5oBe4aX3jtdi2yEtxyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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