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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e34c3c5e034e42544a77a01423e4ab3db4c93d8c6c0b129a3a862a144502e066' 
  AND token = 'BjqABT9Bd0jcKeMjK8Oxjsx5YCA7peTJdSPf+YLt8SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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