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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ba3e635c6bd82764570180ec70b177a2dee952340e68dbbdea79ba308c3cca' 
  AND token = '9Vw5OyvetW9tW30Ij7fdqU/6EuJ7yTNBWW9ohBF9TcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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