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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7845c072a2f4ef01a2b27cba4829fea4ce40cbf1725ba9a68e4224a44923d8e' 
  AND token = '6+KvcZXso8GQzwb9uqi6KJ4e0sb1iH+cSAqV66Z3HLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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