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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '851e70bca544c75da664399743c97b330c693104ba1d7425c380fa639f5c1e99' 
  AND token = 'ROJdEzM27gu2JJiU7eoyRt5AdXt00RfwzUyg4CjV7SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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