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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b5e0908ec85eaec488478292ee658b2acd4757e75a9be2791ea72cd1766dffe' 
  AND token = 'DpD7Jm8gd3NbNQXywHkGfskjoto0jYVia+9FawVTtNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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