SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf180c7c02c94d4e9e8c78f1823a22348da2734d6922a88b35a4db58bccf44b6' 
  AND token = 'Zm+muEVyshqV+XfjqIGgGkBzBYx0Caig/Bwb1sNm1Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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