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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d391fd2c3be4a7d4f55a3d10520446d4893dfe0dda3b1add2fe03106e99833' 
  AND token = '/Xe5OZHxd39Lu1aw76Ua9h9JQqlJZCo+mm8YbuULch0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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