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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afbcfa00a5b268413b8f63d66ec545c4011c9690c0b192bce344a8bd132c5bd0' 
  AND token = 'elpK0fIi3vQd63u87x9TThdEnWCjUUBCu6z51JBci3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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