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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '322e109d113e08cfa0c81122e1967f6d86c73c02901ac6a3f3a5394999f99a84' 
  AND token = '5AEnbk7DLtYDxOLi+lIl0lMs3gq4O0qnSoOwmAHZ0cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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