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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b09e1a5b34eed7e2b88c0a73bd8df6694cb6c1347db848b9dbcccd1b2b5075d' 
  AND token = 'qXkRpmEk5gm6JJ9ZbaCtaAEIgfdl6lCrHfgs/YfXKsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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