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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bdeff8e1a5f08e803ea419aad66facd9d91a2fbc9642413c06933ad79ee4f87' 
  AND token = 'aUa/YUDlk8szJ4Vq+f7Vhix2yS1KuS/VnezHQdLttMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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