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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdbbea1fc70e18b4d91bbb7b2a4cb41318abc462c5ee5e4cf3eada30fb4e1af4' 
  AND token = 'WXhSJ5dyPobfl1i/7Cd+qd2OWXwTgphWDRJYkmhfASQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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