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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3abdfc920e4977eb7a27e445b6422c75eb5603039b861bc294422d343f68c2d9' 
  AND token = 'rbsxcBqMWW4USP6SvYLoD87XXoIs0+/P5w8zWKvvdek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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