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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a3dc43cb7e61d37395e99da7b6ef4c8512c0eb186560e00491b8a044f40f759' 
  AND token = '/PxD04k44XyXUgfKOKJ83+1IzVkfzx6xNBGsmn61p34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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