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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae15b358d294d294fc2855a101bcf7494b297692969b8db06c65d75a00bf1fc' 
  AND token = 'VHDUzOz76obMXns+nB0Xwyn9Al2DANOcQI2wfXrSubc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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