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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942a73cb36b7c82c79d071a65bfd3effacfa46cf541de39121b2aee2357d6841' 
  AND token = 'SSb8swug78oCg42OpZv6a3X77AiQmkepEBTp787bu2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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