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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5114bd3fd69b2e030c02999b34f5d78bffbb6bb4dc517cd5ab50ad97393e5be1' 
  AND token = 'e/D1Hea41SF459QV42h904Y/s1Ts316Fp2GzmhqcPdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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