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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '660512e0039961f218b21546c65b9ef6e397e19ce4fcf0d317ed085ff7985c29' 
  AND token = 'Od1sbOsha62vxnExzkPaT9kuCp+zqzzesu6BNeJ7cPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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