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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29c1cef2796a70d3df3025dcb4370d0ea57f7f3fc8cf901533d2823fab420097' 
  AND token = '9aLTh3uuFd/rgtd02xQs4KN19uhIg9KP++olkA1gJvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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