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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32857d0f3f0d0110a821bb2dd765da0938284a46f68c57d632853f8e95a9d677' 
  AND token = 'I53YVxGCt798nqQ1sfrn2nQ6oAhSX/6NZlXVlRnIYgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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