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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adbbab7cfc2bd36ca567acddedb71114fcbba5371a3b6f03351524aed07eee41' 
  AND token = 'X4m7RGqaXORokaVWscci+SQ71qanTjY+NLB04iG4m9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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