Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c923144aa166b0f02ecab4367f266adb1efb2b4ff4059f07b136b5406c73f87a' 
  AND token = 'XcTd8kTEd++K10gKKwk0V6aaryrNv7EC26fSTeuVsMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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