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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd30b7bb67e93dd138219a519576ac76b242288d99c48e1a1e21debc66ee22d' 
  AND token = 'wIZhHuw9yh5kHiWXiuxVKk25rkdjB312S3vuyZdg7o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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