SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '637170156374c231356056f92edd07f2c0ca80a005e8e895cfa68c88b2dd4c5d' 
  AND token = 'unBwH/ZQhbgKXPOTbVgwSKJ73T+YrF2YKQjbEPhpea0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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