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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85466080c55357be5b763fc26dbd79bbeb3bd6af18dc6e6090f7722d56917bc' 
  AND token = '6LT6DaglBJhJ6LigiDAMWX046mwK8uLzN9eog6mg0qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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