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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aca84e1ab01b698a7fa8da7af4339c4a9ad5a71bd880f3ec8071b22603c8110' 
  AND token = '1MYt0p+U3SlkZWR5D7h/3hOZ9i76vidPX0O53E5UUjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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