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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd017eef18456e7612a4bc841901682df4d8de6f737e838fcbc7e425ae6a12489' 
  AND token = 'e3+lGSmn6IbudPwTQV+Yq57U7Oe/8vSy7oFeyzvNleE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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