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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9fc4a0771d021c22e1c47a6d8599290cd724e9627e5ae37c7867196373a832' 
  AND token = 'bnAY8W0PXWUeL71VBpUB9XDD78VjD85yiWCMjYWW6Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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