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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9988e1c403ad4f7d530edff7d95dec7aec33c9632cbf60631e0c3ae51c2a4401' 
  AND token = 'BYfVxWuqP7tw5UtMeICDPqfOsk7jfcQkUJ4KIvXDQtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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