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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc36372de85caa3f754569b8af95aebbfc81400064756a585ce4d1c229b07628' 
  AND token = 'SIN/xI+fywOJU6/o3jN6VQ+tNUM9J9oacxTMdHELatY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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