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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d3ad8d0796a28bacd4d347dbb10f1936eac3476b5575d1b1fdf81da6413d92' 
  AND token = 'KghylQFdQ642oOvhEZtW9chjz7C0ivjKrMi87u9x9Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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