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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f84a09fd668f3a7a6bad9c2986cb23ef58ebd23d70d08a42e1b53cd81f132f1' 
  AND token = 'VC+uXCEjQ77hQheG42NtwadZDlVUibaplkQ1NJeZk2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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