SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a1a1387e2da698f90fccbd467c85e9227d282e86cf32360d6ed81eb37bc701e' 
  AND token = 'gaG4ZO3dA/hB57/Jw8Nq0mz0Fvp+I6BFnx8KiPG0/ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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