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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d679e6c654bae58d8cf93467b104f3893f12fca563f8e7b6a81b4f93bd68dc' 
  AND token = '6fCcG8v3b8oFsJbI1teNvUebO0pFvaTwoPmRuMvrP3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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