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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68e9f6311c2d00f35d224ce1517c34fab9805759bb38bd8b3ac23aea246e3d3' 
  AND token = '1OdSyXPHCZDQSV+KVcqwvKUU0vR9UR+JKUO3XxQ4CO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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