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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9808e75886517e5be234a28e4fc8ffdc36db7b98479b8bca59a339deabb34448' 
  AND token = '0NT51XN2P7BvJ+cme0oVx1n7RtgXnVnnsWgs71UfSVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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