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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd1b2edb9390070504888586787e84ea6f93cb9a4b9516d29e441eb43f49adb0' 
  AND token = 'ntRnZIA7qtkrl40oXIe/YbA83i6mIfWreNignaukTZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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