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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1698e40607a378da14e940dad4eda31b7218ab3e967357a9712e6af7fffe56a0' 
  AND token = 'AvOZfbt5nryOyifjH9TDE8ckfzyJdAdeQLy5Mzroazs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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