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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '592a030aaa70dfd7f3e031083f1fa07f86e563bd9963bd2726ccd1ff234a0361' 
  AND token = 'GZZEIg9Y1yfKSdWRg25cVWKqclB6pp5c5Z8Uyxa7fqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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