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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e6ea0515d7b042a3467b62806bb621b2af383b440a94363a55b579723a9cae' 
  AND token = 'a4QdY1xyIslZ4YSjRm1Ed3fLLvtpBxtr/9ybnMKY00Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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