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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d44e7035c755ce85b2963929edb2f31f626584e1b98417177911547fca20f4' 
  AND token = 'QhgTVZ1E9tbBO4slp5H5vkjr4sdNH35KC3QaKofFgHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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