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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '065d35f10919a391b9f1e9876dfa435f705b46947d50983a85eec4a4da809894' 
  AND token = '3g7I1jRel5i8+EsHOWtLNes7Nm7gOmUq/Cju5CVBfUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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