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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79dc1d1478628fd4219754944f64c40dd1900979a19e6b7f91db794f2f1a384' 
  AND token = 'oSl4an4l++PxnI5nQQVt8/mPY+IZNvgut8lo5FneLQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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