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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be17733f5f8a38a63607a2a43777f7cef47542fd3f98bcea4a4a9bc75876deea' 
  AND token = '0udDUMC7WrbJ9ggOlEbCAVwyKz9jw1VTYVu5evwcZr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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