SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9398c156e0dc22f4030fc525728146b2d41fbe9209dc86a4fcd50363149a7f1' 
  AND token = 'JxBVtYSOEJkTBpBYhV/xAf9WVWgYvSRK1jzxQt42QFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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