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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae32eed9f2dc63becd288c899f6a56f0a3ea6709cadbb9ffbdf04c554aae2fe' 
  AND token = 'TK3dufYPUeL9rZl5JO+jy7p7atbjQLu2GP2zMAG/2hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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