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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5204f19bbca9784fe90d744c0d5e0fee0aab3e4569e8bab2ba267374f2fc7b' 
  AND token = '7xD77UZehAB8E8hIbFUB/M9SFwQoSnozWe7OK+V9O44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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