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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dde210713c9a5a9eebb6b63e7c61f8bea75883a8adc9306fc4b21d56368fbcd' 
  AND token = 'lX5mDV7CEi5v9bx6S/jxMf5k+1zPOmReD01jWaf5N+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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