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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f04565c606a080c03fbf1ff370ab21ccbe6ae460befad647663cf6a539e4cc4' 
  AND token = 'JlHXilDkGqNDucgzQAzmwHbDU4KUMRZIZmvRCD5n9OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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