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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1740a5a80806c37ae88c734e380e010e689319c0f397e9f63d9a2847935efddf' 
  AND token = '1ZE+BLfC7fikPS8AhCSvK8lUt672Z6e5RD7bzSI9nqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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