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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175b50af0673d37afb2c67b20c133b6dc7f6bdf7bb962590405529a05d995992' 
  AND token = 'w5f4cFfxXZRRBE57dk8ait2M0ZnVEe/z0CQ6jqn3DPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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