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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f6df654021c0ab89632a60de7520e28c967ae686b3eb6510c16a665c04210e' 
  AND token = 'liC4Wvk7ANPLhMpi8/6JBmIXgd8k4CmgA9OAAwY0ELI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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