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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40333e8aecaaa9a28b5fa97263cdea905a03b4d0e5e7fc1a2ddaaeb5504e6ffa' 
  AND token = 'tn+BjNNIbt8mRQmw0B1iwNxJ7u2ZH3jqoZxAYB85jp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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