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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aaf3a17dc37951acf6c701b7d6f4c69765b3d429b5c7cc35927077abd76d644' 
  AND token = '6OoF3E0T0oHoWzKzISIv9H5eZYZyiYyIIsnoAfU6z5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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