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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ccbb597f066c9c0fa04ba2a9c53c9ca326e53bc7b4b4911a24e36960ce38aea' 
  AND token = '8J1/jUDvRKucYzA4WtaOgfNosySWHkXnbJiNLreZXR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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