Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b50f4d01104cf9f99a40f5bd78d080a6e112943c1aa21b963555f365ca003590' 
  AND token = '3NHes32exdnBDR2tV62woMHLHS59VmJ16UCjB+uAY6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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