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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aded272ac02af20bc4ac7e99429db5dde03866b2bbb8ed6f6a893f2e32c5c079' 
  AND token = 'H9KwF4pcrQ8iZqWJy/UQAuf6AWL5FKuq7u5tl5I4QeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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