Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e02b6f62eb0b87880a8ee96cd8de431527ac5cf005b3bbac23374c67e81ea4c' 
  AND token = 'UYwo1PpJ6HYjCQmnu0TqSy8K6NK7OUwZ5JUZdgNmk1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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