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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd17f98d043ac3d1da4bccd8e71e8474756811dce72dd178cf08aa06e7fe632b7' 
  AND token = '6d9HV0L4t9Y0WuPKok7jaq69TbzYJCoVc04PmyeJCnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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