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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3912ae13e695ddd308a40cf1d607e3d40cf80f3c6fa7a147ac3653c9d1098ab5' 
  AND token = 'i98Hd6fObKt6B4vFo4WeGcOj7NepYH8DY5HoQdCaYBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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