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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '568ebe4bffe58611b4cf6e2cedff6c06211bbe41d79c1280c0dc4414b1daf599' 
  AND token = 'A31Ca/k22TB3s8YVg96twCCQFsxJQdQrEJqXoWtgoHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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