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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47171e3e0efc6c953d964a4e1d328e30b6057b3c4226b5c3514c5e085994f6ae' 
  AND token = '6X7NBql6DV8fQ+8zoetWV4cinWTYJhqXx8uOvdbm0a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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