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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8adfe4fa01ae6c8342d2744288d9f7db4156891bcfd178ba2987632cf3b5352c' 
  AND token = 'mOVPVNKpJUGIAQS5KRIf3ArGE2ID+a6MNqfSS4OsLhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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