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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c31a52e56bffae3ff92382bca43b5ea79c5173bd4ebf7285b03a33e780b018' 
  AND token = 'KC0uaA43uimDv2jnJzhA+tfOa4Igys+ZDurPs3fp2AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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