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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f78ed2dbfb10fc0a47c37e7bf51f3e6c9398f5c60de62039489f2f449d94bf3' 
  AND token = 'ga1WdxMf0YOngHgtkgfOQRd0KVqK4mEd+7RjkhaX/Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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