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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1a8f9b82cc99ccc1a722a6a90c8b427435fbdc6e4a8ad1a1a2fd39e6fbd61a9' 
  AND token = 'wme/3qrei+D1+tCNIysD1Xkb2Wg1GQ2kcoO4QHmoisM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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