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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce24d04fa11cc1986530713cc3b1925577feeeb1a70f99178e3912539a0c718d' 
  AND token = 'vDZUzclyP969m6lyDeJumLys9yAE7v2rl7J+RCz8leQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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