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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01e95990db23885a0900b2292f4309812198c53492cb34beb61ee6b9b9eb20df' 
  AND token = 'V3O7u3Yiy61HNGzAz44GbdXbl016+skVHR/cLbCD5sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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