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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66e1d2356856bb127791fc6233362f5be41fb07c381047a9b95d517a127e985a' 
  AND token = 'jSOD94b2QAxYUSTZW6DZqd5T3vbHvPQtadRHBkHULd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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