SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bdc98365c2b3abc61c7c65ca08b89ab7754ff2ed83b0b5c61a8a012ff15b3ed' 
  AND token = 'qkxbJDJeKgmu4jBRYh+K/iU4qVZ0NUYnTwuKJp31QPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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