SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1135302850704e5c4739f5c8ba6d39146ea87bf982f5cfccf7cc2f3a1ceadaa5' 
  AND token = '+GRjKMZrteYRzs/Y4iHINYigxBTI+6r3LLVNPaxqJXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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