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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5872dcf832a1b762f875c0296f1c11d574fbb9a3e2f7f3bbae7d04514dfb72' 
  AND token = 'rha+HLfIhWIhuipkwM5k3cXW/627ZeR7XNvtWOu1C0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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